ASTM D6066-11
(Practice)Standard Practice for Determining the Normalized Penetration Resistance of Sands for Evaluation of Liquefaction Potential (Withdrawn 2020)
Standard Practice for Determining the Normalized Penetration Resistance of Sands for Evaluation of Liquefaction Potential (Withdrawn 2020)
SIGNIFICANCE AND USE
Normalization of penetration resistance data is a frequently used method to evaluate the liquefaction susceptibility of sands. A large case history database from many countries has been accumulated to estimate instability of saturated sands during earthquakes (1,2,3,4). This test is used extensively for a great variety of geotechnical exploration programs where earthquake induced instability of soil needs to be evaluated. Many widely published correlations and local correlations are available, which relate penetration resistance to the engineering properties of soils and the behavior of earthworks and foundations. The data from different countries with differing drilling techniques have been interpreted to develop a preferred normalization approach. This approach has been termed the N1 method proposed by H. Bolton Seed and his colleagues (2,3). Evaluation of liquefaction potential is beyond the scope of this practice. Interpretation of normalized penetration resistance values should be performed by qualified personnel familiar with the multitude of factors influencing interpretation of the data. One purpose of this practice is to attempt to develop a more accurate data base of penetration resistance data from future liquefaction case histories. The normalized penetration resistance determined in this practice may be useful for determination of other engineering properties of sands.
This practice is based on field studies of limited depth and chamber testing of limited stress conditions (1,2,5,6). The existing data bases also are limited in soil types examined. Drilling equipment and methods vary widely from country to country. The majority of data is obtained using the fluid rotary method of drilling with small drill rods and donut or safety type hammers. Some studies have shown that other drilling methods, such as hollow stem augers can be used to successfully collect penetration resistance data (7,8). When using alternate drilling methods, however, it is easier ...
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1.1 This practice outlines a procedure to obtain a record of normalized resistance of sands to the penetration of a standard sampler driven by a standard energy for estimating soil liquefaction potential during earthquakes. The normalized penetration resistance determined in this practice may be useful for determination of other engineering properties of sands.
1.2 This practice uses Test Method D1586 with additions and modifications to minimize disturbance of saturated loose cohesionless sands during drilling. This practice combines results of Test Method D1586 and interprets the data for normalization purposes.
1.3 Due to inherent variability of the SPT, guidance is given on test configuration and energy adjustments. Penetration resistance is adjusted for energy delivered in the penetration test. Energy adjustments can be estimated or measured and reported.
1.4 Standard practice for normalizing penetration resistance values is given. Penetration resistance data are normalized to a standard overburden stress level.
1.5 The normalized penetration resistance data may be used to estimate liquefaction resistance of saturated sands from earthquake shaking. Evaluation of liquefaction resistance may be applied to natural ground conditions or foundations for either planned or existing structures.
1.6 Using this practice representative disturbed samples of the soil can be collected for identification purposes.
1.7 This practice is limited to use in cohesionless soils (see Test Method D2487 and classifications of SM, SW, SP, SP-SM, and SW-SM Practice D2488). In most cases, testing is performed in saturated deposits below the water table. In some cases, dry sands may be tested (see 5.4). This practice is not applicable to lithified materials or fine grained soils. Gravel can interfere with the test and result in elevated penetration resistance values. Normalization of penetration resistance values for gravelly soils is...
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D6066 − 11
Standard Practice for
Determining the Normalized Penetration Resistance of
1
Sands for Evaluation of Liquefaction Potential
This standard is issued under the fixed designation D6066; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope resistance values. Normalization of penetration resistance val-
ues for gravelly soils is beyond the scope of this practice.
1.1 This practice outlines a procedure to obtain a record of
normalized resistance of sands to the penetration of a standard 1.8 Penetration resistance measurements often will involve
sampler driven by a standard energy for estimating soil safety planning, administration, and documentation.This prac-
liquefaction potential during earthquakes. The normalized tice does not purport to address all aspects of exploration and
penetrationresistancedeterminedinthispracticemaybeuseful site safety. This standard does not purport to address all of the
for determination of other engineering properties of sands. safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
1.2 This practice uses Test Method D1586 with additions
priate safety and health practices and determine the applica-
and modifications to minimize disturbance of saturated loose
bility of regulatory limitations prior to use.Performanceofthe
cohesionless sands during drilling. This practice combines
test usually involves use of a drill rig; therefore, safety
results of Test Method D1586 and interprets the data for
requirements as outlined in applicable safety standards. For
normalization purposes.
2 3
example, OSHA regulations, DCDMA safety manual, drill-
1.3 DuetoinherentvariabilityoftheSPT,guidanceisgiven
ing safety manuals, and other applicable state and local
on test configuration and energy adjustments. Penetration
regulations must be observed.
resistance is adjusted for energy delivered in the penetration
1.9 The values stated in inch-pound units are to be regarded
test. Energy adjustments can be estimated or measured and
as standard. Within the text, the SI units, are shown in
reported.
parentheses. The values stated in each system are not
1.4 Standard practice for normalizing penetration resistance
equivalents,therefore,eachsystemmustbeusedindependently
values is given. Penetration resistance data are normalized to a of the other.
standard overburden stress level.
1.9.1 In pressure correction calculations, common units are
2 2
ton/ft , kg/cm , atm, and bars. Since these units are approxi-
1.5 The normalized penetration resistance data may be used
matelyequal(withinafactorof1.1),manyengineerspreferthe
to estimate liquefaction resistance of saturated sands from
use of these units in stress correction calculations. For those
earthquake shaking. Evaluation of liquefaction resistance may
2
using kPa or kN/m , 100 kPa is approximately equal to one
be applied to natural ground conditions or foundations for
2
ton/ft . The stress exponent, n, (see 3.3.2) is approximately
either planned or existing structures.
equal for these units.
1.6 Using this practice representative disturbed samples of
1.10 This practice may not be applicable in some countries,
the soil can be collected for identification purposes.
states, or localities, where rules or standards may differ for
1.7 This practice is limited to use in cohesionless soils (see
applyingpenetrationresistancetoliquefactionestimates.Other
TestMethodD2487andclassificationsofSM,SW,SP,SP-SM,
practices exist for estimating soil instability from penetration
and SW-SM Practice D2488). In most cases, testing is per-
resistance data. Procedures may change with advances in
formed in saturated deposits below the water table. In some
geotechnical engineering. It is dependent on the user in
cases, dry sands may be tested (see 5.4). This practice is not
consultation with experienced engineers to select appropriate
applicabletolithifiedmaterialsorfinegrainedsoils.Gravelcan
methods and correction to data. In earthquake engineering
interfere with the test and result in elevated penetration
studies, many phenomena can affect soil instability. The
practice reflects only one current exploration technique and
1
This practice is under the jurisdiction of ASTM Committee D18 on Soil and
Rock and is the direct responsibility of Subcommittee D18.02 on Sampling and
Related Field Testing for Soil Evaluations.
2
Current edition approved Dec. 1, 2011. Published January 2012. Originally Available from OSHA, 1825 K. Street, NW, Washington, DC 20006.
3
approved in 1996. Last previous edition appr
...
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